P0403 on Volkswagen
Exhaust Gas Recirculation Circuit Malfunction
P0403 on Volkswagen vehicles indicates exhaust gas recirculation circuit malfunction. Au7o has documented this code across 6 Volkswagen models — most commonly on Atlas, Atlas Cross Sport, CC. This emissions code indicates a malfunction in the exhaust gas recirculation (EGR) control circuit. The EGR system routes a small amount of exhaust back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer commands the EGR valve open and closed through this circuit. The code sets when the electrical control signal to the EGR valve or its solenoid is out of the expected range — for example, an open, short, or a commanded change that doesn't produce the right feedback. It generally points to an electrical or wiring problem in the EGR control circuit, or the EGR valve/solenoid itself, rather than carbon clogging alone. Typical repair costs on Volkswagen range from $100 to $6,000, depending on the specific model and root cause.
Common Causes of P0403
- •Faulty EGR valve or EGR solenoid
- •Damaged wiring or connector in the EGR control circuit
- •Open or short in the EGR control wiring
- •Corroded or loose EGR connector
- •Blown fuse or lost power supply to the EGR circuit
- •Carbon buildup binding the EGR valve
- •Faulty engine control module or driver circuit
P0403 on Volkswagen by Model
Volkswagen Atlas(1 issue)
- 8-Speed Automatic Transmission Rough Shifting and Shudder2018-2024
The Aisin 8-speed automatic transmission (AWF8G45) in the Atlas develops rough shifting, hesitation, and shudder, particularly in the 2-3 and 3-4 gear transitions. The torque converter lockup clutch can shudder at highway speeds (40-65 mph). VW has released multiple transmission software updates (TCU reflash) to address shift quality, but hardware issues including valve body wear and torque converter degradation can require physical repairs.
Volkswagen Atlas Cross Sport(1 issue)
- Rear Taillight Seal Water Intrusion2020-2023
Like its Atlas sibling, the Atlas Cross Sport suffers from water intrusion through rear taillight seals. The sloped rear design makes it particularly susceptible to water running down and entering through degraded gaskets. Water accumulates in the spare tire well and cargo area, causing mold, corrosion, and potential electrical damage to rear components.
Volkswagen CC(1 issue)
- Plastic Water Pump and Thermostat Housing Leak2009-2017
The CC shares the EA888 engine's plastic water pump and thermostat housing failure common to the VW/Audi 2.0T platform. The plastic housing cracks from thermal cycling, causing coolant leaks that can lead to engine overheating. The failure is gradual, starting with weeping that becomes a full leak. The CC's engine bay heat retention (due to the coupe-like design) can accelerate the plastic degradation.
Volkswagen Golf(1 issue)
- EA888 Plastic Water Pump and Thermostat Housing Failure2008-2020
The EA888 2.0T engine uses a plastic water pump housing and thermostat that are prone to cracking and leaking coolant. The plastic degrades from heat cycling, causing external leaks, overheating, and potential engine damage if not caught early. VW issued TSB 19-15-01 addressing the updated water pump assembly. The failure typically occurs between 50,000-100,000 miles. Coolant may leak onto the timing cover or drip from the front of the engine.
Volkswagen Jetta(1 issue)
- Water Pump/Thermostat Housing Failure2008-2019
The plastic water pump and thermostat housing are prone to cracking and leaking. The impeller inside the water pump can also degrade. This is a common failure point on the EA888 engine, often occurring between 60,000-100,000 miles.
Volkswagen Tiguan(1 issue)
- EA888 Water Pump and Thermostat Housing Failure2009-2021
The Tiguan's EA888 2.0T engine shares the plastic water pump and thermostat housing that is prone to cracking and catastrophic coolant loss. The plastic housing degrades from heat cycling and can crack without warning, leading to rapid coolant loss and engine overheating. This is one of the most reported Tiguan issues across all model years. Both the first-generation (2009-2017) and second-generation (2018-2021) Tiguans are affected.
Looking for P0403 on a different make?
View P0403 across all makes →Frequently Asked Questions
What does P0403 mean on Volkswagen?▼
P0403 stands for "Exhaust Gas Recirculation Circuit Malfunction." This emissions code indicates a malfunction in the exhaust gas recirculation (EGR) control circuit. The EGR system routes a small amount of exhaust back into the intake to lower combustion temperatures and reduce nitrogen-oxide emissions, and the computer commands the EGR valve open and closed through this circuit. The code sets when the electrical control signal to the EGR valve or its solenoid is out of the expected range — for example, an open, short, or a commanded change that doesn't produce the right feedback. It generally points to an electrical or wiring problem in the EGR control circuit, or the EGR valve/solenoid itself, rather than carbon clogging alone. On Volkswagen specifically, this code is documented across 6 models.
What causes P0403 on Volkswagen vehicles?▼
Common causes on Volkswagen: Faulty EGR valve or EGR solenoid, Damaged wiring or connector in the EGR control circuit, Open or short in the EGR control wiring, Corroded or loose EGR connector, Blown fuse or lost power supply to the EGR circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0403 on a Volkswagen?▼
Repair costs on Volkswagen range from $100 to $6,000, depending on the specific model and root cause.
Which Volkswagen models have P0403 documented?▼
Au7o has documented P0403 on 6 Volkswagen models: Atlas, Atlas Cross Sport, CC, Golf, Jetta, Tiguan.